Quantities or interactions which violate parity (P) and time-reversal
(T) symmetries are usually sensitive to new physics beyond the Standard
Model of particle physics. Direct searches for T-violating quantities
are also promising in revealing new sources of charge conjugation and
parity (CP) symmetry violation. The current understanding of the
baryogenesis suggests that other sources of CP violation might exist in
nature beyond the Standard Model and beyond what have been observed so
far. In this talk, I will discuss two experiments concerning such direct
searches: the neutron electric dipole moment and a tabletop experiment
looking for spin-dependent short-range forces. In the latter case, I
will present the latest limits from our work and future prospects.